*Naoji Koizumi¹, Shinsuke Minote², Tatsuya Tanaka³, Azumi Mori⁴, Takumi Ajiki⁵, Tsutomu Sato⁶, Hiroshi A Takahashi⁶, Norio Matsumoto⁶ (1.School of Environmental Science,the University of Shiga Prefecture, 2.Taneya Co.Ltd., 3.JA Lake Otsu, 4.Yodogawa Hu-Tech Co., Ltd., 5.Kinki Eco Science Inc., 6.Geological Survey of Japan, AIST)